If a word's last consonant bears shaddah, the doubling is not cancelled by stopping. Shaddah indicates a strengthened or doubled articulation. Making the final letter still does not justify turning it into a weak, ordinary single consonant.
When stopping on «الْحَقُّ», the final qaf retains the quality of doubling even though its ordinary dammah is removed.
With a doubled final letter such as the ba of «رَبِّ», rawm is considered, where appropriate, in relation to its underlying kasrah.
If the original final vowel is dammah, the relevant conditions for rawm or ishmam may also arise. Yet the consonant's doubling must be preserved in all permitted forms. Dropping or flattening its emphatic articulation is an error, not a method of waqf.