It's possible to turn the research facility quest in before the Acid Hunters

[Barry]

Accidentally skipped the dialogue to turn in Cornell's head at Coretech by going for the "I went to the facility" dialogue option, now I can't turn talk to Rupert at all to give him Cornell's head.

[Barry]

Also, first time I went to him I couldn't mention I already visited the Acid Hunters hideout, after I reloaded a previous quicksave the option appeared. The option doesn't appear with "So, you want them dead?" dialogue option, but it does with "What do you want me to do?".

[PhrygianDominant]

Ah, you shouldn't even have that option that early. Fixed everything for the next patch.