Is it normal to not receive a visa stamp on the same day after applying for an O visa in Thailand?

Please advise if this is normal.

I arrived on a 30 day exempt visa. It has since been extended to the 9th of April in Surat Thani.

I went to Phuket immigration (main office) to convert to O visa. (90 day)

Attached is what is needed.

(I don't know how tourists can come here to convert and open bank accounts).

I completed all my needed docs. I sat with the officer who questioned me about not having a lease or house docs. All i had was a letter from my hotel. (i am staying in hotels until i find an area I like).

I paid the 2000 baht and waited until my passport was ready.

15 mins later they handed back my unstamped passport and said "come back on the 11th of April" . (9th falls on a Saturday).

I asked, “that date will be over staying my visa". They said "do not worry, come back, bring receipt and you'll get your visa".

Is this normal or should i have received a stamp on the day?

Cheers 🙏