I got these commands for my displays set (same issue when I make FIRST not ALL)
[REPLACEALL]1 Besetzt 24m x 15m[WITH]1 Frei 24m x 15m
[REPLACEALL]1 Frei 24m x 15m[WITH]1 Besetzt 24m x 15m
but the output is:
"1 Frei 24m x 15m"
or"1 Besetzt 24m x 15m"
the former
[REPLACEALL]1 Besetzt[WITH]1 Frei
[REPLACEALL]1 Frei[WITH]1 Besetzt
worked fine
in your preview the space is not displayed either
so please view it in edit task to see the problem (with the space)