Multiple commits in vuex action not triggering mutation - vue.js

Question

I'm attempting to set a loading status on a component which will display a loading graphic while the request is being processed. I have this working with a call to an API, returning a promise from a fetch to a REST interface. However, when attempting this with a simple call to a service it only seems to call the last mutation
In the vuex store:
var initialState = {
status: { loading: false },
all_clients: [],
current_client: {
loaded: false,
}
}
export const fund = {
namespaced: true,
state: initialState,
actions: {
getClientOverview({ commit }, client_group_id) {
commit('loadingRequest');
clientService.getClientOverview(client_group_id)
.then(
clientInfo => {
commit('loadingSuccess')
},
error => {
commit('loadingError', error);
}
)
}
},
mutations: {
// Mutations to set loading and error statuses
loadingRequest(state) {
state.status = { loading: true };
},
loadingSuccess(state) {
state.status = { loading: false };
},
loadingError(state,error) {
state.status = { loading: false };
store.dispatch('alert/error', "Error Loading Client: " + error)
},
}
and in the corresponding client service that is called:
function getClientOverview(client_group_id) {
return new Promise((resolve,reject) => {
try {
// Note here that client.state.all_clients is an array of objects already set in the store
let clientDetail = client.state.all_clients.filter(function(item) {
return item.client_group_id === client_group_id;
});
// THIS PAUSE CODE JUST ADDED TO SLOW THINGS DOWN A BIT ON FRONT END
// SO I CAN SEE IF MUTATIONS ARE WORKING CORRECTLY
var d = new Date();
var d2 = null;
do { d2 = new Date(); }
while(d2-d < 2000);
// TO HERE
if(clientDetail.length == 0){
reject("Client Information not found")
}
resolve(clientDetail[0])
}catch(error){
reject(error)
}
})
}
A client is being returned as expected, as a resolved promise, but I only see 'loading' being set to false on the front end, it doesn't set to true while the service is running its process.
If I remove the commit('loadingSuccess') line then I can see the original commit being called as expected and loading being set to true - it seems as though only one commit is being called per action
Any help with this would be gratefully appreciated!
Thanks