[BP MB-39857 to 6.6.1] - [N1QL] creating an index on bucket name with % in the name fails

While testing out the MP I ran into this error. I have a bucket named default%bucket. When I try to create an index on this bucket through various methods(curl, UI, cbq): it always fails with this error:
create index idx on `default%bucket`(name)

[

{ "code": 5000, "msg": "GSI CreateIndex() - cause: Encountered transient error. Index creation will be retried in background. Error: Index idx will retry building in the background for reason: Error Connecting KV 127.0.0.1:8091 Err HTTP error 404 Object Not Found getting \"http://127.0.0.1:8091/pools/default/buckets/default%2525bucket?bucket_uuid=7b1183539c684de465392fe007fa43d5\": Requested resource not found.\r\n.\n", "query": "create index idx on `default%bucket`(name)" }

]

I do not see this issue with default.bucket, defferred indexes are created correctly. This issue is seen even before the fix on 6.5.1-6299

Logs attached.