The positive side of this is:

I've just found out (from the comment section of the last Educational round) that my problem is identical to TKOC 2021/4, which I had already solved. Now I feel less sad. (If 1913D - Array Collapse didn't appear, in my round there would have been a problem which already appeared previously.)

Actually, when I invented my problem, I thought I had already seen something similar on the TLX website, but I convinced myself the "similar problem" was this problem, which is much harder, and I missed that I had actually seen an identical problem.

The fact you don't reveal the second problem means that there won't be any replacements in Hello 2023. I wonder, whether you are allowed to participate in the round :D. Most likely, you are eligible to take part in the contest, but were persuaded not to use your advantage of knowing a problem, right?

https://en.wikipedia.org/wiki/Noosphere

Invent original problems based on real life or games. Pure math problems can coincide with much higher probability.