Your edits are correct.
The reason behind this is there was confusion about the definition of bottomless.
Previously, it was used like "no skirts" or "no pants" here. Which means if the characters only wear panties, it still counts as "bottomless".
But it has been discussed and changed to today's definition, which is same as Danbooru's, and also more consistent with topless.
Previous discussion (one of them): https://yande.re/forum/show/3575?page=15
Definition changes: https://yande.re/wiki/diff?title=bottomless&commit=Compare&to=5&from=3
But unfortunately, some old images' tags didn't get fixed. It is very welcome to help us about that!
The reason behind this is there was confusion about the definition of bottomless.
Previously, it was used like "no skirts" or "no pants" here. Which means if the characters only wear panties, it still counts as "bottomless".
But it has been discussed and changed to today's definition, which is same as Danbooru's, and also more consistent with topless.
Previous discussion (one of them): https://yande.re/forum/show/3575?page=15
Definition changes: https://yande.re/wiki/diff?title=bottomless&commit=Compare&to=5&from=3
But unfortunately, some old images' tags didn't get fixed. It is very welcome to help us about that!
yrumddldluxduzrf
Regarding bottomless + pantsu
Could some mod mass-revert my edits if I'm incorrect in my tag interpretations please?
Examples of what I meant (these had bottomless pantsu at least before I edited the tags):
post #98266; post #185260, post #144653,
post #190108, post #154662, post #154637,
post #153610, post #153591, post #153556,
post #150592, post #150598, post #150367 (unlike its child, post #150368),
post #148041, post #147984, post #148262,
post #148412, post #148977, post #149404,
post #145836 (despite see_through), and many more.