Hi,
In my 10.5.16 (at the time it was maybe running 10.5.15) data directory I found some strange files:
-rw-r----- 1 mysql mysql 67108864 Dec 21 2021 0x003d7642_data.000000
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-rw-r----- 1 mysql mysql 67108864 Dec 21 2021 0x003d7642_data.000001
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-rw-r----- 1 mysql mysql 67108864 Dec 21 2021 0x003d7642_data.000002
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-rw-r----- 1 mysql mysql 67108864 Dec 21 2021 0x003d7642_data.000003
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-rw-r----- 1 mysql mysql 67108864 Dec 24 2021 0x0096557b_data.000000
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-rw-r----- 1 mysql mysql 67108864 Dec 24 2021 0x009693e2_data.000000
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My guess is that this is coming from LOAD DATA splitting in Galera (which then crashed) but I am not sure as I cannot find anything about it in the documentation.
Can you perhps elaborate what these files are? And, add it to the documentation 
Thank you,
Michaël