The British never had the intention to…
1816 CE
Lord Hastings had given up his plan to dismember Nepal from fear of antagonizing China, whose vassal Nepal in theory is.
In 1815, while British forces were campaigning in far western Nepal, a high-ranking Manchu official had advanced with a large military force from China to Lhasa; and the following year, after the Anglo-Nepalese treaty had been signed, the Chinese army moves south again, right up to Nepal’s frontier.
The Nepalese panic, because memories are still vivid of the Chinese invasion of 1792, and there is a flurry of urgent diplomatic activity.
Hastings sends mollifying assurances to the imperial authorities, and orders the British Resident, newly arrived in Kathmandu, to pack his bags and be ready to leave at once if the Chinese invade again.
Due to the forced treaty under compulsion and duress, experts on international treaty view that Nepal might not have had the capability to recognize the Sugauli as a sound treaty.