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Possible Solutions

There is a number of ways to solve this problem. The simplest one is to forbid Indirect Addressing over the same register. This may be convincing specially because pointing a register with itself does not seems very useful in the first place.

Another solution is to always latch the Address Bus content using a MAR register as most computers do. But I don't want to because it will defeat my data-transfer philosophy all together. A more convincing argument for not to use a MAR register is the delay penalty it would impose to every bus cycle.

There are still more solutions. For instance, I can use the OR register only for those problematic cases. During indirect addressing instructions register OR is not used.

The definite solution is still pending but we can see that the simple data-transfer philosophy I staked on have not been defeated yet.