Unknown BLE SoC inside a Fresh ‘n Rebel “Smart Finder”

Hi all, hoping someone recognizes this chip or the reference design.
The device is a cheap Apple Find My–compatible Bluetooth tag, bought at ACTION sold under the name Fresh 'n Rebel "Smart Finder" (model 6ATAG72R).

The PCB silkscreen reads "4B-SF18-OMAAF-1.0.1"
The main IC is QFN, 32-pin, with a blob of blue lacquer/dot-of-paint covering the middle of the marking. Acetone is not effective against the colored dot.

What I can read on the main IC despite the lacquer dot:

• Line 1: ...868...
• Line 2: 55...CM
• Line 3: B0T0720

Board has 8 labeled test points (from T1 to T8).

What I've done so far:

• Confirmed via continuity: T2 = GND (also has continuity to the metal can of the 32 MHz crystal, which tracks (can shields are usually grounded)
• Mapped average DC voltage on every test point with the oscilloscope (device powered, idle):
  • T1 = 3.16 V
  • T2 = GND (0 V, confirmed above)
  • T3 = 3.16 V
  • T4 = 3.16 V
  • T5 = floating reads an unstable -2.88 to -2.91 V
  • T6 = 3.17 V
  • T7 = 3.16 V
  • T8 = 3.16 V