android 刘海尖和全面屏底部多出安全区域

android 刘海尖和全面屏底部多出一定高度，目测接近iOS安全区域高度。但是配置的是无安全区域，plus.navigator.getSafeAreaInsets()获取的四个值都是0，sdk版本是2019年12月11日版本
manifest配置:

        "safearea" : {  
            "background" : "none",  
            "bottom" : {  
                "offset" : "none"  
            }  
        }

css:

.am-home-nav {  
    padding-bottom: 0 !important;  
    background-color: #fff;  
    border-top: 1px solid #ebebeb;  
    z-index: 4  
}  

.am-home-nav>a {  
    display: block;  
    width: 33.3333%;  
    height: 48px;  
    float: left;  
    margin: 0;  
    padding: 0;  
    padding-top: 1.75rem;  
    position: relative;  
    border-left: 0;  
    border-radius: 0;  
    text-align: center;  
    color: #000;  
    font-size: .75rem;  
    overflow: hidden  
}  

.am-home-nav>a.am-on {  
    color: #1496ff  
}  

.am-home-nav>a.am-active {  
    background-color: #f2f2f2  
}  

.am-home-nav>a span {  
    display: block;  
    position: absolute;  
    left: 50%;  
    top: 6px;  
    -webkit-transform: translate3d(-50%, 0, 0)  
}  

@media screen and (max-width:320px) {  
    .am-home-nav>a {  
        padding-top: 1.9rem  
    }  
}

html

<div class="am-home-nav">  
        <a  class="am-btn home am-on">首页<span class="am-icon-dock-home"></span></a>  
        <a  class="am-btn pro">理财<span class="am-icon-dock-pro"></span></a>  
        <a  class="am-btn my">我的<span class="am-icon-dock-my"></span></a>  
    </div>