Routine code gets whipped out when a parameter added
If you editing a code of a routine (procedure or a function) but has not compiled it yet and then you add a parameter, the code of the routine gets refreshed and you loose all the code code you wrote before latest compilation. There was no such an issue in older versions of dbForge for MySQL (tested on 10.1.24)

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AdminDevart (_, Devart) commented
Dear User,
Thank you for your post!
To conduct a thorough analysis of the issue, we'll need clear reproduction steps. Could you please provide a detailed sequence of actions that lead to the error, as well as the expected outcome? This will assist us in accurately recreating the issue on our end.
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Devart Team