While wax is standard procedure, I suggest always checking the neck has been drilled sufficiently deep for the body and neck screws you use.
I never did after installing 30+ necks the past 20-ish year, until I got this beautiful ebony Warmoth neck I was pairing with a Fender USA guitar body + Fender neck screws.
There was resistance so I kept forcing a bit more, after all ebony is a dense wood right ? Until I heard that beautiful cracking sound you really don't want to hear.
In short: I don't know if those Fender USA screws were longer than usual, the body's neck pocket was deeper than usual (likely not), or neck holes weren't as deep as they should have been but the end result was a severely cracked neck heel.
Luckily glue can fix that up very nicely but since then I check it's drilled sufficiently deep if I encounter any unusual resistance.