the issue that it stays at 99% for a long time is normal. on my Kindle Paperwhite 4 (not the 2021 one) i have this too. it usually helps if you charge it 1 hour or so longer. if you then disconnect it and wait 2-5 minutes or so it jumps to 100%. Kindles just seem to don't display the correct battery charge sometimes so its showing you 99% even if its fully charged.
my PW4 as an example shows its charged completly by its green led, but it still says only 99%. if i then keep charging for a while it is 100%. sometimes it also jumps to 100% from 99% if after i disconnect the charging cable.
so.. don't worry about that. its normal.
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