It is not feasible to substitute air for other blocks since it lacks a blockstate and the fill command won't work without one. I am hoping that the devs would bring back the fill command in its previous format, where you simply write the state number. It was easier before but now the "/fill ~~~~~~ air 0 replace air" because the "0" won't work anymore
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We're tracking this issue in MCPE-166828, so this ticket is being resolved and linked as a duplicate.
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fill ~~~ ~~~ air 0
🙂