The support for RangeSubset is not implemented at all for 1.1.
GDAL fails to read data from multiband datasets from Mapserver WCS with
"Returned tile does not match expected band count"
because all bands are returned.
The same for 2.0 was fixed here #3689.
This issue has been closed due to lack of activity. This doesn't mean the issue is invalid, it simply got no attention within the last year. Please reopen with missing/relevant information if still valid.
Typically, issues fall in this state for one of the following reasons: