This doesn't seem to occur 100% of the time, but on several occasions now, the description for my PRs have disappeared after I resubmitted them. For example, https://tangled.org/sheetr.app/alicia/pulls/21 had a description until I submitted round 1, when it disappeared.
The record on my PDS has been edited, so it's not just an appview problem: https://pds.ls/at://did:plc:7x6wc6fbj464biqdarmhxucv/sh.tangled.repo.pull/3mrl7gbs5t222