Walt Disney World has updated their face covering policy to now ban face coverings containing valves, mesh material or holes of any kind. The updated policy applies to all of Walt Disney World property including Disney Springs and resorts.
The Center for Disease Control has also commented on the use of masks/respirators with exhalation valves:
Respirators with exhalation valves protect the wearer from SARS-CoV-2, the virus that causes COVID-19, but may not prevent the virus spreading from the wearer to others (that is, they may not be effective for source control). Until data are available to describe how effective respirators with exhalation valves are in preventing the spread of SARS-CoV-2 from the wearer to others:
Wear a respirator without an exhalation valve when both source control and respiratory protection are required.
If only a respirator with an exhalation valve is available and source control is needed, cover the exhalation valve with a surgical mask, procedure mask, or a cloth face covering that does not interfere with the respirator fit.
Source: CDC
Walt Disney World previously updated their face covering policy to indicate that you can remove your mask if you are actively eating or drinking but you must be stationary and maintain appropriate physical distancing.
News Source: Walt Disney World