Created attachment 111580 [details]
Screenshot, which shows image in navigator, but not in writer

Have a look at the screenshot.
Image is marked in the navigator.
The image seems to be gone outside the page.

This bug happens since LO 3.5, last working version here LO 3.4.6.2, first version with buggy behavior LO 3.5.0beta0.
The character of the bug differs a little bit. Up to LO 4.1 the third image appears at the bottom of the page and the second image seems to be lost. Since LO 4.2 the third image appears at the position the second image has been before.
The bug appears also in all LO 4.3 and LO 4.4.0.1
Tested with OpenSUSE 12.3 64bit rpm Linux.

Seems the description isn't exactly enough. So let me try again:

Download the attaches Zip-file.
Unzip the file.
There are 3 screenshot, a Writer-document and a screenshot, which will show the problem.
1. Open LO, create a new Writer-document
2. Insert → Image → From File : "p1.png"
3. Mark the image, set Anchor → AS Character
4. Put the cursor after the image and press [Enter]
5. Insert → Image → From File : "p2.png"
6. Mark the image, set Anchor → AS Character
7. Put the cursor after the image and press [Enter]
8. Insert → Image → From File : "p3.png"

The second image will disappear. It will only happen when you insert the images in the order I described. Other way there is enough place for all images beneath each other. So don't change "p1.png" with "p2.png" or something else.
You could see the second image isn't lost, when you open the naviagor. or just klick with the mouse at the bottom of the page. You will see the marks of the imageframe. Now search a little bit with the mouse. The cursor will show the image will be at the bottom border of the page, only ca. 2mm inside the writing-border of the first page of the document.

You could see the result also by opening the Writer-document of the Zip-file.

confirmed with LibO 4.3.1.2 de Linux RPM x64 (parallel install) -> NEW

also reproducible with LibO 4.3.5.2 de Linux RPM x64, parallel install

Created attachment 111639 [details]
Zip-file with Writer-document and one image. Put cursor at the end and add image ...

Seems the description is too complicated.
So I added another attachment. It contains a Writer-document and one image ("p3.png").
1. Open wirter document.
2. Set the cursor at the end of the text on the page.
3. Insert → Image → From File : "3.png"

The second image in the Writer-document will be lost.

You could see the frame at the bottom of the document when using the navigator. The frame seems to be empty. A click on the frame and you could see in the properties of the image there should be the image inside the frame ...

also reproducable with LibreOffice 4.2.8 on Windows Vista (32-bit)

Bug still exists with LO 5.1.0.2, OpenSUSE 42.1 Leap, 64bit rpm Linux.

Adding keyword 'bibisectRequest' to see whether this regression is already present in the oldest build of bibisect-43all repository or not.
In case it's already present, change 'bibisectRequest' to 'preBibisect'.
Otherwise, change 'bibisectRequest' to 'bibisected' and add a comment with the output from 'git bisect log'

(In reply to Xisco Faulí from comment #9)
> Adding keyword 'bibisectRequest' to see whether this regression is already
> present in the oldest build of bibisect-43all repository or not.
> In case it's already present, change 'bibisectRequest' to 'preBibisect'.
> Otherwise, change 'bibisectRequest' to 'bibisected' and add a comment with
> the output from 'git bisect log'

The first commit in bibisect-43all is from 2011-08-22 while 3.5.0 beta0 is from Nov-Dec 2011: https://wiki.documentfoundation.org/ReleasePlan/3.5

Thus changing to preBibisect

Still repro.

Arch Linux 64-bit
Version: 6.1.0.0.alpha1+
Build ID: 5956828c88501ef1366e60010b05053a8e1e642e
CPU threads: 8; OS: Linux 4.16; UI render: default; VCL: kde4; 
Locale: fi-FI (fi_FI.UTF-8); Calc: group
Built on May 23rd 2018

Have tested again with description in comment 2.
Buggy behaviour is the same. Second image has been hidden at the bottom of the page.
Tested with OpenSUSE 15, LO 6.2.4.2 64bit rpm Linux

Created attachment 158523 [details]
Hidden image with Writer but no hidden with Ms Word or Google docs

Bug unsolved with LibreOffice Writer 6.3.5.2
Patch : 
Open a new file
Copy paste all to the new file.
The hidden images are not copied to the new file.

1 Open a .doc file containing 2 images
2 delete these 2 images
3 insert a new image
4 save the file to .doc and to .odt
5 open .odt with writer: only one image is shown
6 Open .doc file with either MS Word or Google docs the 3 images are shown
7 rename .odt file to .zip 
8 Extract the .zip file, in Pictures sub-directory all 3 files are present. 
Content of Manifest.xml under META-INF: 
<manifest:file-entry manifest:full-path="Pictures/10000000000002F3000000F249AFED37C5F7CF15.jpg" manifest:media-type="image/jpeg"/>
 <manifest:file-entry manifest:full-path="Pictures/100002010000077F000003914CEC0053F7C16880.png" manifest:media-type="image/png"/>
 <manifest:file-entry manifest:full-path="Pictures/10000000000003E3000002A9D61BA6E419043E8D.jpg" manifest:media-type="image/jpeg"/>
9 rename .zip back to .odt.

*** Bug 131884 has been marked as a duplicate of this bug. ***

reproduced as in comment 5 with:

Version: 7.3.0.0.beta1 / LibreOffice Community
Build ID: 436f14c25ec1847646b953cf13d0db4f7ca3be57
CPU threads: 4; OS: Linux 5.4; UI render: default; VCL: gtk3
Locale: en-AU (en_AU.UTF-8); UI: en-US
Calc: threaded

Reproduced as in comment 5

Version: 7.3.4.2 (x64) / LibreOffice Community
Build ID: 728fec16bd5f605073805c3c9e7c4212a0120dc5
CPU threads: 2; OS: Windows 10.0 Build 19044; UI render: Skia/Raster; VCL: win
Locale: fr-FR (fr_FR); UI: fr-FR
Calc: CL

Thanks for listening

Bug still exists in LO 24.2.4.2 on OpenSUSE 15.6 64bit rpm Linux.