reactjs - InputText bottom border disappears automatically all of sudden -

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i'm seeing inputtext bottom border disappears automatically of sudden. if restart application in simulator, see border again. disappears when make change pushes hot-reload in simulator. i'm 100% sure, not because of changes because if restart app in simulator, see bottom border again. i'm using rn 0.30 , android simulator. know what's happening? please see picture below. enter image description here 

       <textinput           placeholder="title"           style={styles.inputfield}           placeholdertextcolor={theme.placeholdertextcolor}           maxlength={50}           returnkeytype={'next'}           ref={(c) => { this._fieldtitle = c; }}           value={title}           onfocus={() => {             this.inputfocused(this._fieldtitle);             this.setstate({ showtitlelabel: true });           }}           onchangetext={(title) => this.setstate({ title })}           onendediting={this._validatetitle}           onblur={() => {             if (title === null || title === '') {               this.setstate({ showtitlelabel: false });             }           }}         />


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