Created attachment 188664 [details]
Sample

Also in
Version: 7.0.7.0.0+ (x64)
Build ID: 626ea4e62a3e5005fe9825923a1c0c5bdb61cc08
CPU threads: 4; OS: Windows 6.3 Build 9600; UI render: default; VCL: win
Locale: nl-NL (nl_NL); UI: en-US
Calc: CL

and in
Version: 6.1.6.3
Build ID: 5896ab1714085361c45cf540f76f60673dd96a72
CPU threads: 4; OS: Windows 6.3; UI render: default; 
Locale: nl-NL (nl_NL); Calc: CL

not in (or only increasing once) in
Versie: 4.4.7.2 
Build ID: f3153a8b245191196a4b6b9abd1d0da16eead600
Locale: nl_NL

Reproduced in recent master build:

Version: 24.2.0.0.alpha0+ (X86_64) / LibreOffice Community
Build ID: d16d86685afdf3d321cc282a39a65f38381b6eaa
CPU threads: 8; OS: Linux 5.15; UI render: default; VCL: gtk3
Locale: en-AU (en_AU.UTF-8); UI: en-US
Calc: threaded

With example document, original size is 11.62 × 4.00 cm, second paste in Writer is 11.65 × 4.03 cm, then keeps growing on subsequent pastes.

Before 6.1, size would increase on first paste form 11.61 × 3.99 to 11.61 × 4.01 and eventually plateau at 11.63 × 4.01 after a few pastes, which is still an issue but is barely noticeable by the user.
Similar in OOo 3.3.

Change in behaviour was bibisected with linux-64-6.1 to only a range as paste would crash because of bug 116977: dfefe448c41921f2f1e54d3f69b8b9e89031d055..91b0d2122bdee361bf5412a42d48ff051159cbf2

Notes:
- also reproduce with a simple shape
- not reproduced when pasting into Calc or Draw, and not reproduced when pasting from Writer to Impress. That's because Writer overwrites the select object, whereas other components make copies. I assume it is related to rounding errors and making an object fit into the allocated space when overwriting.
- dimensions can increase or decrease depending on the size of the original object

Created attachment 188695 [details]
another sample fontwork

With this fontwork example, the steps result in differently drastic results in 6.0 and 6.1:
- in 6.0, slowly changes dimension and then rapidly reduces in height
- in 6.1, continually increases in height while first increasing, then decreasing, then increasing again in width

So issue depends on original object and did not start in 6.1.

Dear Telesto,

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MassPing-UntouchedBug