lv_label glitch when container is smaller than label size

[shahawi-sumup]

LVGL version

v8.4.0

Platform

Simulator (Linux SDL2)

What happened?

I'm migrating from LVGL v7.11 to v8.4.0

As you can see in the attached screenshot when a label is inside of a smaller container, there is an extra black bar got drawn randomly (on the side, or on the bottom).

In LVGL v7.11, this wasn't an issue, was always working.

Thanks in advance :)

How to reproduce?

void bug_screen()
{
    lv_obj_t* screen = lv_scr_act();
    lv_obj_clean(screen);

    /* Case1: Hello World label working fine */
    lv_obj_t* cont = lv_obj_create(screen);
    lv_obj_set_flex_flow(cont, LV_FLEX_FLOW_ROW);
    lv_obj_set_size(cont, LV_SIZE_CONTENT, LV_SIZE_CONTENT);

    lv_obj_t* lbl = lv_label_create(cont);
    lv_label_set_text(lbl, "Hello World!");
    lv_obj_align(cont, LV_ALIGN_TOP_LEFT, 0, 10);

    /* Case2: Hello World label has a bug of an extra black bar drawn below H letter */
    lv_obj_t* cont2 = lv_obj_create(screen);
    lv_obj_set_size(cont2, 50, LV_SIZE_CONTENT);
    lv_obj_t* lbl2 = lv_label_create(cont2);
    lv_label_set_text(lbl2, "Hello World!");
    lv_obj_align(cont2, LV_ALIGN_BOTTOM_LEFT, 0, -10);

    /* Case3: X label has a bug of an extra black bar drawn on the right side */
    lv_obj_t* cont3 = lv_obj_create(screen);
    lv_obj_set_size(cont3, 20, 30);
    lv_obj_t* lbl3 = lv_label_create(cont3);
    lv_label_set_text(lbl3, "x");
    lv_obj_align(lbl3, LV_ALIGN_CENTER, 0, 0);
    lv_obj_align(cont3, LV_ALIGN_CENTER, 0, 0);

}