Problem with kerning palette

selecting pairs in the kerning palette shows a quite strange result. Sometimes the pair doesn’t show up, sometimes the left glyph will be added again…
Bildschirmvideo aufnehmen 2024-05-03 um 10.53.35-2

It might be that there is no glyph for that group (any more)?

No. Every glyph in font. And export=true.
The non-accessiblity is a very old problem in my case. Some of the kerning classes are not named like the glyph because of an exchange from first to replacement glyph. (e.g. kerning class “a” is for a glyph named “a.1” now ).

And the addition of the same left glyph is new in 3.2.

Can you send me that file?