FireDAC TFDScript error trying to drop a non-existent table - delphi

Question

I have a nasty error when executing a Firedac TFDScript error trying to drop a non-existent table:
Delphi Berlin 10.1 Upd 2
Database Firebird 2.5
It give an error when calling FDScript.ExecuteAll (it passes the FDScript.ValidateAll without any problem)
The code I am executing is as follows:
FDScript: TFDScript;
{...}
begin
FDScript.ScriptOptions.Reset;
FDScript.SQLScripts.Clear;
FDScript.SQLScriptFileName := '';
FDScript.ScriptOptions.CommandSeparator := ';';
FDScript.ScriptOptions.CommitEachNCommands := 1;
FDScript.ScriptOptions.DropNonexistObj := True; // seems to ignore this directive
FDConnection.StartTransaction;
try
FDScript.SQLScripts.Add.SQL.Add('drop table countries;');
FDScript.ValidateAll; // no errors here
ScriptStatus := GetEnumName(TypeInfo(TFDScriptStatus), Ord(FDScript.Status));
if FDScript.Status = ssFinishSuccess then begin
FDScript.ExecuteAll; // ERROR HERE! TABLE COUNTRIES DOES NOT EXIXTS
if FDScript.TotalErrors = 0 then begin
FDConnection.Commit;
end
else begin
FDConnection.Rollback;
end;
end
else begin
FDConnection.Rollback;
end;
except
FDConnection.Rollback;
raise;
end;
end;

Answer 1

Implementation seems to be correct. The engine checks if a raised exception is of ekObjNotExists kind, and if so and the DropNonexistObj property is enabled and command kind is DROP or ALTER, it logs to its console. Otherwise re-raises the caught exception.
The only explanation is then, that you are seeing an exception message dialog shown by debugger. These dialogs are displayed even for handled exceptions (so long you won't add them to an ignore list or turn this feature off, which you should not do).