Just ran eclean-dist -d and it removed distfiles for all texlive 2020 packages, while the packages are installed. emerge says distfiles need to be downloaded again. Reproducible: Didn't try
Works fine for me. For the texlive 2020 packages, I think the cause of this was probably the remanifest, see https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=f7135a4f2e39dff8d7240b32bcaf8c6005bda445
Please test and report. Collect additional information on IRC, #gentoo if unsure.