Should I be concerned when loop gain rises back above 0dB on simulation?
The rise of the gain above app. 1.5 MHz is caused by the capacitor Cbp, of course. As can be seen, a part of the test signal is coupled to the opamp output directly via Cbp: For rising frequencies the opamp output voltage continuously decreases and the output impedance increases so that the effect of the signal through Cbp also increases with frequency. (The same effect can be observed for Sallen-Key lowpass filters).

By the way - what is the purpose of Cbp? "Upset" the break of the feedback loop? This is not necessary for simulating the loop gain response. Note that this capacitor deteriorates the loop gain function.