With the second delivery of British tanks something very unpleasant can happen (May 1919).
It is possible for them to arrive in Batumi - however with Georgia neutral, the these tanks got automatically relocated to Persia in my last campaign (see screen).
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Essentially they are now removed from the game. If you have ever tried marching around the Black Sea in this game you know that I am lucky if they ever arrive at the Volga. - More likely they will starve in the desert or be lost to attrition.
The reason for this is the last variant of the Tank reinforcement event: evt_nam_Renforts_WHI_BritishTanks2E in the Grand Campaign event file.
My suggestion: Delete that one all together and change the probabilities for the other variants.
The chance of what happened to me is very low (each of the 4 other variants has a 30% probability) - but still this is very annoying.