That lack of voltage drop means the PIC is taking virtually no current like 0.5mA or less which makes the collapsing onboard power supply an ongoing mystery.
Also the sine waves on the resonator look strange to me - what is marked on the resonator? (should have it's frequency marked on it)
Looks like you have the timebase set to 0.2uS/Div and period of the wave is about 0.9 of a division so ~0.18uS which is around 5.6MHz
If it's 0.5uS/Div then it's about 2.2MHz
But the good news is the oscillator appears to be running and that PIC has a very low operating current (~200uA at those frequencies) and is potentially OK, it would seem at least.
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