Created attachment 95396 [details]
Spreadsheet with filter samples and repro instructions.
I was using the Autofilter function to select rows in a spreadsheet in order to categorize these rows by filling in a "category value" in an empty column. The easiest way is of course to select all the filtered cells at once and, using ALT-enter, quickly fill in the same category value.
It appears however, that these ALT-entered values can NOT be selected in subsequent Autofilter actions!
I made some more tests in the attached "Autofilter test.ods" file. It appears that there is a problem for date-formatted cells in general but also for text-formatted cells when using ALT-enter.
I haven't tested yet in different versions.
*** This bug has been marked as a duplicate of bug 73565 ***