Try installing the ACC Magisk module and run the command "acc -t". It will test all known strategies and save the results to /sdcard/Download/acc-t_output.txt. You can then add one of the working control files reported in Battery Charge Limit's settings.
You can also just use ACC if you like, it still gets updates and support. Just install ACCA or ACCSettings for a gui similar to Battery Charge Limit's.
I did, got this output:
1/6: /proc/mtk_battery_cmd/current_cmd 0::0 0::1
switch: off (0 1) current: 1mA (Idle)
switch: on (0 0) current: 535mA (Charging)
Switch works

- battIdleMode=true
2/6: /proc/mtk_battery_cmd/current_cmd 0::0 0::1 /proc/mtk_battery_cmd/en_power_path 1 0
switch: off (0 1, 1) current: 3mA (Idle)
switch: on (0 0, 1) current: 542mA (Charging)
Switch works

- battIdleMode=true
3/6: mtk-master-charger/constant_charge_current_max 1980000 0
switch: off (1980000) current: 1mA (Idle)
switch: on (0) current: 463mA (Charging)
Switch works

- battIdleMode=true
4/6: usb/current_max 1500000 0
switch: off (1500000) current: 544mA (Charging)
Switch doesn't work
5/6: mtk-master-charger/constant_charge_current_max 1980000 50000
switch: off (1980000) current: 0mA (Idle)
switch: on (0) current: 590mA (Charging)
Switch works

- battIdleMode=true
6/6: usb/current_max 1500000 50000
switch: off (1500000) current: 588mA (Charging)
Switch doesn't work
I've selected the ones with a green checkmark (one by one) from the above list, and pressed Test the charging switch (from the app), the result: an error has occurred.
Edit: Manually selecting the first profile from the list above stopped the charging at 75% which was the plan. Not sure why the error came up but it works.