[Spryng] A transaction request is failed if the «dynamic_descriptor» property contains a dot despite this character is not forbidden

Extensions Spryng
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1

A transaction request is failed if the «dynamic_descriptor» contains a dot.
E.g.: MAGE2.PRO
The API response:

{"code":107,"details":{"body.dynamic_descriptor":"is invalid or missing"},"message":"at least one parameter is malformed (truncated...)

So it looks like Spryng have provided me an incomplete set of the forbidden characters.