app_timer stopped with LVGL

Hi,I'm develop with the nRF52840 V17.0.2 ,SD 7.2.0

problem about migrate LVGL 8.1

I have few app_timer ,they are work fine

try to migrate LVGL

alfter lv_init(), app_timer work fine too

But alfter lv_port_disp_init() , all app_timer stopped

why it occurs?

Thanks for any help

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