Hi Bastian,
Somehow, the content permission sets for those master pages were empty (null).
I have tested the solution to find all such pages and delete them with these SQL commands. I had H2 database, so you might want to adapt them for your DB of choice.
--select the pages within a space with empty permission set
select c.contentid, c.title from content c, spaces s where c.spaceid = s.spaceid and s.spacekey = 'DECSM' and c.contentid in (select cps.content_id from CONTENT_PERM_SET cps left join CONTENT_PERM cp on cps.id = cp.cps_id where cps.cont_perm_type = 'Edit' and cp.id is null group by cps.id, cps.content_id)
--select the empty edit permission sets across all spaces
select cps.content_id from CONTENT_PERM_SET cps left join CONTENT_PERM cp on cps.id = cp.cps_id where cps.cont_perm_type = 'Edit' and cp.id is null group by cps.id, cps.content_id
--delete the content permission sets for affected pages in all spaces
delete from content_perm_set where id in (select cps.id from CONTENT_PERM_SET cps left join CONTENT_PERM cp on cps.id = cp.cps_id where cps.cont_perm_type = 'Edit' and cp.id is null group by cps.id, cps.content_id)
After you execute the delete command, you have to flush Confluence cache (Admin -> Cache Management -> Flush All) in order to see changes. After that those pages should be moveable and will have a move button in the tools menu.
Cheers,
Roman.
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