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clean the surface, then float on your mastic then tile, but since you have a crack, that crack will contract and expand with the seasons.
Therefore, ceramic will not contract or expand and you will have a crack sooner or later in that area.
If you want to monitor the crack for a full set of seasons and measure it with a micrometer, then you can experiment.
But, I would float it out and apply a nice vino.
sorry, but better now than later.
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