pragma nonreentrancy on  is only avaiable from Vyper 0.4.2 ownardsSince the compiler version is not specific, and it starts from 0.4.1 (# @version ~=0.4.1), there is a possibility that the ending contract doesn't have this feature enabled.
Consider using a specific version of Vyper in your contracts instead of a wide version. For example, instead of # @version ^0.4.1, use # @version ~=0.4.1.
Impact:
All functions ARE REENTRANT BY DEFAULT
Use a ~= compatible release clause or a == version matching clause for the compiler version with a more modern version of Vyper.
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