I am running a local testnet of a 2-validator-node polkadot Relay Chain (release-v0.9.27) and I am trying to connect a parachain-template to it (v0.9.27), with custom keys. The Relay Chain is working as intended, producing and finalizing blocks.
When I connect the parachain (have tried with 1 collator and 2 collators) to the Relay Chain, the parachain tries to import the first block but never does it, and all I get is
Collation wasn't advertised to any validator. That procedure continues for a while (5-10mins) and then I get the following errors:
[Parachain] Block import error: State Database error: Too many sibling blocks inserted [Parachain] Error with block built on 0xda79ce961787fcc5e5a97a19cd2a03695b30ee1791fb94a5045cf58f164951d0: Import failed: State Database error: Too many sibling blocks inserted [Parachain] Failed to collect collation info. error=Application(UnknownBlock("Header was not found in the database: 0x89acf273da66c70e14bd8c5daac0f82235522d15a61ef0a06d925dcf08a3340d"))
I have checked everything in these sanity checklists (How can I get my parachain to produce blocks? (sanity checklist) and Our parachain doesn't produce blocks [checklist]) and everything should work.
I have also tried increasing the Validator count of the Relay Chain to 3 and I am still getting the same results.