AD9361 Manual AGC: In-band amplitude drops with strong out-of-band blocker

Hello,

We are using ad9361 on a custom board (no OS driver), TDD mode.

Setup / configuration:
RX/TX LO: 2.3 GHz
RX RF bandwidth: 8 MHz
AGC: Manual AGC, split gain table
Split table index: 0x16
Received signal: CW at ~-50 dBm into RX antenna port
Blocker/interferer: strong signal transmitted to the same RX port at 2.1 GHz (out-of-band)

Observation
When the strong out-of-band signal at 2.1 GHz is present, the amplitude of the received baseband samples at 2.3 GHz is reduced (see attached plot: “No Jammer” vs “With Jammer”).
This happens even though AGC is set to manual and the gain table index remains fixed.

In this table index the iLNA gain is set to minimum = 3dB

What could cause the in-band amplitude reduction in this scenario?

Thanks