Yes, I guess that’s the reason.
You could try it but if it doesn’t work please try to update a lamp instance with following command. In this case the force parameter is needed but it shouldn’t be set for conventional updates.
See also Request to join Nethforge for ns8-lamp - #6 by stephdl
api-cli run update-module --data '{"module_url":"ghcr.io/nethserver/lamp:1.3.3","instances":["lamp1"],"force":true}'