ePWM-triggered ADC interrupt frequency incorrect in C2000 Simulink model (worked earlier)

I am using a TI C280x/C2833x target in MATLAB/Simulink 2024b.

My system timing is driven as follows:

• ePWM (hardware module ePWM1) generates SOCA
• SOCA triggers ADC start of conversion
• ADC end-of-conversion interrupt is used as the main ISR via C28x Hardware Interrupt block
• This ISR runs the control algorithm

The configuration details are:

• SYSCLK = 150 MHz (PLL enabled, auto-configured)
• HSPCLK = SYSCLK / 2
• ePWM:
• Up-count mode
• TBPRD = 2083
• TBCLKDIV = 4
• HSPCLKDIV = 1
• SOCA enabled at CTR = ZERO, first event
• ADC:
• Sequential mode
• Start of conversion = ePWMxA
• Interrupt posted at end of conversion

Issue:

The actual interrupt execution frequency is incorrect, regardless of the frequency I compute or expect from TBPRD and clock settings. The model runs stably, but the ISR rate does not match the configured PWM frequency.

This same model previously worked correctly (older MATLAB version / earlier project), and there are no math or algorithm changes.