Getting typescript errors on compilation but not on serve

I am all of a sudden getting the following errors that weren’t there a few days ago.

ERROR in src/app/gap-game/gap-game.page.html(61,75): The right-hand side of an arithmetic operation must be of type 'any', 'number', 'bigint' or an enum type.
src/app/gap-game/gap-game.page.html(60,141): The right-hand side of an arithmetic operation must be of type 'any', 'number', 'bigint' or an enum type.
src/app/transformation-game/transformation-game.page.html(80,86): The right-hand side of an arithmetic operation must be of type 'any', 'number', 'bigint' or an enum type.
src/app/transformation-game/transformation-game.page.html(79,151): The right-hand side of an arithmetic operation must be of type 'any', 'number', 'bigint' or an enum type.
src/app/transformation-game/transformation-game.page.html(91,89): The right-hand side of an arithmetic operation must be of type 'any', 'number', 'bigint' or an enum type.

These don’t make sense; in the first case, 61,75 is a space character. These errors do not show up in either ionic serve or the more complicated way of doing live-reload on-device.

This is the latest Ionic 5, latest cordova, Angular 9 all up to date, TS 3.8.3. Any guidance would be greatly appreciated.

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