recaching public objects does not work

prescale fails because the object is not flagged public

https://dev.textgridlab.org/1.0/tgcrud-public/rest/textgrid:3tmwc.0/recache

2024-12-11 11:26:25,250 INFO  [cla.tex.mid.mes.MessageConsumerAbs] (executor-thread-1) {TGLoggingMessageConsumer} Received message: CrudMessage{objectId='textgrid:3tmwc.0', operation='8', format='image/png', rootId='', public='false'}

whereas 3twmc.0 is public:

https://dev.textgridrep.org/browse/3tmwc.0