I'm not sure if this is a bug or not but it seems that after fixing the bugs related to arming (plastic) explosives in 1.22, the spawn rate of these plastic explosives have been decreased. For every plastic explosive I've found so far, I've found at least 2-3 remote detonators... Before, this used to be about around 50/50.
Plastic explosives (and remote detonators) have always been quite rare and thus hard to find. Now that we can finally use them without them getting bugged, I find it strange that they are even harder to find now.
Please take a look at this.