toolkit nifi set-param actions sometimes end with error Error deleting parameter context update request: Could not find a Request with identifier ...

Hello, 

I'm sending nifi tookit 1.27.0 nifi set-param commands to a nifi 1.27.0 cluster
to add parameter key/values to an existing parameter context

In an intermittent way,
the nifi set-param commands properly set the key/value in the PC
but end in error with message
Error deleting parameter context update request: Could not find a Request with identifier xxx

I sometimes, not systematically, get the same error message when manipulating the PC key/value pairs via th UI ( when applying the changes ).

From a network point of view I see 404 not found errors when the problem occurs

Is this a known issue ?
Is there any way to avoid/solve this problem ?

Regards