"You have left the party" immediately when sending invites

Often when trying to invite somebody who just sent a request via the trade site, as soon as they accept the invite I see them join the party, followed by, "You have left the party," and we are no longer grouped.

1) Unlike other bug reports that are similar, I can try to invite them repeatedly but the same thing happens over and over.

2) Sometimes they invite me instead, and that seems to always work.

3) This is the strange part: It seems to happen exclusively with bulk crafting items like white sapphire rings and stellar amulets. This leads me to believe it is related to crafting warriors who are joining/leaving parties at a relatively high rate.

4) Relog or even completely killing the client and restarting does not have any noticeable effect.

5) I'm on ps5. The few people trying to join my party who have responded when I asked were all on PC and do not have cross-platform disabled.

6) As a wild guess, I'd say this is 80% of the people trying to join invites to buy the crafting items. Eventually it works.

My apologies if this is a known issue, but I can't find any reports of the exact issue.