I am using a TRM1038 and 3.3V. The Pi is powered using this 2A switching power supply.
In the other thread I referenced, I think you mentioned you are using a TSOP38238. Is that still the case? If so, I will start by switching over to that sensor and see if it resolves the problem. “Reference 1” in my original post also mentioned fixing this problem by switching to a new sensor (TSOP4838, in that case). So I am hopeful it is simply a sensor issue. Good to know you do not have this issue.
I am curious about your statement that the noise would come from the power adapter. Wouldn’t the Raspberry Pi have some kind of conditioning circuitry to clean it up? As far as I know, the supply is providing the 5V (reported to be clean in “Reference 2”), and the 3.3V comes from onboard circuitry (reported to have noise). So doesn’t this suggest an issue on the Pi itself?