Nope, if you’re feeling okay after your main session then by all means go ahead and add some extra endurance! It’s often recommended to extend the cooldown for those looking to add some extra aerobic volume. (and the key there is to keep it easy- any extra hard riding will likely impact your recovery and the rest of your plan)
Whether this strategy works for you, however, is based on how you’re feeling with your current training load. if the outdoor riding starts impacting your key sessions, it’s probably better to transfer to a low-volume plan while you’re doing the extra rides. (I usually do HV, but have moved to MV now I’m getting outside more.)
If you have lower-intensity workouts scheduled, those are also good candidates to replace with outdoor rides of a similar difficulty and duration. recovery and endurance rides are way more engaging outdoors IMO.