Off-screen "deaths" are classic "gotcha!" instruments for The Walking Dead universe. Who could forget Glenn being "eaten" by walkers, only for a later episode to reveal that he climbed under the dumpster in an event now infamously known as "Dumpster-Gate." Fear the Walking Dead's Daniel Salazar seemingly burned himself alive in Season 2, but returned in Season 3 to then have another fake-out death. Season 4 continued the trend once more with Madison Clark, with her grand return being in Season 7.
Source:https://www.cbr.com/fear-the-walking-dead-troy-return-not-end-of-alicia/