Regex: options not being processed?

It seems the regex options in the option(boolean) form are not being processed:

$ swipl
Welcome to SWI-Prolog (threaded, 64 bits, version 8.1.26)
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software.
Please run ?- license. for legal details.

For online help and background, visit https://www.swi-prolog.org
For built-in help, use ?- help(Topic). or ?- apropos(Word).

1 ?- re_matchsub("\\d.*\\d"/s,"1\n2",Dict,[]).
Dict = re_match{0:"1\n2"}.

2 ?- re_matchsub("\\d.*\\d","1\n2",Dict,[dotall(true)]).
false.

It works fine with the /s at the end of the regex, but dotall(true) is not being processed.

There are two types of options to the regex predicates: those that affect the pattern and are passed to the regex compilation and those that affect the execution. As these predicates cache and reuse the compiled patterns flags that apply to the compilation have no effect.

I’ve added a couple of lines to the docs.

Thanks! Appreciate the clarification, especially adding it to the docs.