Collation changes

Hello,

I thought I had understood the problems with libc collation changes, but today a Fedora update showed me, that I probably did not :)

After refreshing the encodings for the databases (and reindexing) I thought I'd have a look at the versions in pg_collation using the following query:

select collname,
collversion,
pg_encoding_to_char(collencoding) as encoding,
pg_collation_actual_version(oid)
from pg_collation
where collprovider = 'c'
and collversion <> pg_collation_actual_version(oid)

The query returned several hundred collations, all with a non UTF-8 encoding (mostly single byte encodings).

Running "alter collation ... refresh version" on them resulted in

NOTICE: version has not changed

Which confuses me, as the above query showed collversion = 2.41 and pg_collation_actual_version() returned 2.43

Can someone clear up my confusion?