FTFY
and why the germans stereotypical siding with the japanese? the japanese after all still have a treaty with the british.
The treaty isn't worth the paper it's on. Even IOTL, the Japanese predicted as early as 1916 that come 1922, the British probably wouldn't renew their alliance, and even actively sounded out Imperial Russia as Japan's new ally. And the Russians were actually receptive, with both Foreign Minister Sazanov and even Tsar Nicholas II expressing interest in a similar arrangement with Japan over China as they already had in Manchuria. Despite their loss in 1905, the Russians by 1916 had largely reconciled with the Japanese, and saw them as a useful ally to secure their eastern frontier so they could focus on Europe, maybe even Central Asia.
As for the British, as early as 1905, the alliance with Japan was already under question, especially by the Australians. Then there's Japan's intervention in Indochina ITTL, which has previously been mentioned as alarming Britain, with only the fear of Germany snapping Japan up keeping the British from dropping Japan then and there. The question thus becomes if Britain will continue to value the alliance come 1922, and which the Dominions - Canada and Australia, especially - will have influence over.
I suspect that much like IOTL, Canada and Australia will both pressure Britain to end the alliance with Japan, which will likely align with Germany, assuming the Tsarists lose the Russian Civil War. If the Tsarists win, then assuming things went as per OTL, then Japan will align with Russia. Worst-case scenario for Britain, a resurgent Russia aligns with Germany
and Japan, but that doesn't seem likely here, given the continued existence of the Ottoman Empire (what with Russian ambitions of reclaiming Tsargrad after so long).