Table tx_odsosm_layer not recreated on update
I found that the table tx_odsosm_layer was not recreated on update, so the columns were in different order and therefore had wrong values in it (i.e. the max_zoom value was stored in the atribution column).
Manually running the sql commands from ext_tables_static+adt.sql fixed the problem, whereas running the update script from extension manager didn't.
I explored the file ext_tables_static+adt.sql and found that my IDE (NetBeans) displayed the line
DROP TABLE IF EXISTS tx_odsosm_layer;
commented out (deactivated). Adding a simple space oder newline character after the former '#' made the IDE show the above line as activated. See attached files for illustration of this. Maybe this also prevented TYPO3 from recreating the table on update?