Looks like this is directly related to my latest suggestion about a differentiation between a read-only and a write lock mode for the placeholders.
… with the added problem that lately, we have observed that under certain conditions the mentioned trick with clearing the placeholder first does not seem to do the trick and the player will still throw a “record locked” error…
https://community.tulip.co/t/introduce-an-explicit-read-write-lock-for-placeholder-records/11789/2