Hey! We came accross this same issue today, however I think I found a solution:
I noticed the following text under the option "Unavailable actions" in the bottom of the page when selecting edit issues in Bulk operation (Step 3 of 4: Operation details):
"Change Fix Version/s - NOTE: This operation can be performed only on issues from ONE project"
So I tried changing my search to include issues from only one project (Project = XXX) and tried again with Bulk change. The "Change fixVersion" was now included as an edit option with these 4 alternatives: "Add to existing; Clear Field; Replace all with; Find and remove these"
This at least solves our problem - hopefully it helps others as well :-)
issue has raised with atlassian related to bulk edit fixversion, check this
some one given asnswer for this here
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